[Axapta-Knowledge-Village] Lookup based on some condition

[venki_armold]

Hi,
 

  I am attaching the items to the vendors
  Now in the purchase order for the lookup of itemid i want the items   
  to be displayed in the lookup based on the vendor attached to that 
  particular Purchase order
       i.e; i want lookup based on some criteria
  How can i do this?
   
   Can any one help me in this regard?